摘要
采用光学显微镜、拉伸试验机、扫描电镜及显微硬度计研究了激光焊、氩弧焊及电子束焊3种焊接工艺对Ti2Al Nb合金焊接接头组织和性能的影响。结果表明,激光焊试样焊缝组织为O相和B2相的双相组织,氩弧焊试样焊缝主要由α2相、B2相和较少的O相构成,电子束焊试样热影响区主要由B2相和O相组成,焊缝主要由O相组成;Ti2Al Nb合金经激光焊后可获得最优的室温拉伸性能和最高室温显微硬度,其抗拉强度为1003 MPa,规定塑性延伸强度为912 MPa,伸长率为5.5%,室温显微硬度平均值为475 HV0.2;经电子束焊后可获得最优的高温拉伸性能,其抗拉强度为240 MPa,规定塑性延伸强度为177 MPa,伸长率为13.5%。
The effect of welding methods of laser welding,argon-arc welding and electron beam welding on microstructure and mechanical properties of Ti2Al Nb alloy was investigated by optical microscope,tensile testing machine,SEM and microhardness tester.The results show that the microstructure of laser-welded beam is composed of B2 phase and O phase,the microstructure of argon-arc-welded beam isα2phase,B2 phase and O phase,the microstructure of electron-welded beam heat affected zone is B2 phase and O phase,the microstructure of welded beam is O phase.The laser-welded Ti2Al Nb alloy has the best tensile property（The tensile strength Rmis 1003 MPa,the proof strength,plastic extension R（p0.2）is 912 MPa,the elongation is 5.5%）and microhardness at room temperature（The average value is 475 HV0.2）.The electron-welded beam Ti2Al Nb alloy has the best tensile property at high temperature（The tensile strength Rmis 240 MPa,the proof strength,plastic extension R（p0.2）is 177 MPa,the elongation is 13.5%）.
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第1期72-77,共6页
Heat Treatment of Metals
基金
“高档数控机床与基础制造装备”科技重大专项(2014ZX04001-141)
关键词
TI2ALNB基合金
激光焊
氩弧焊
电子束焊
组织
性能
Ti2AlNb
laser welding
argon-arc welding
electron beam welding
microstructure
mechanical property
